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Reinsurance - Effects Of Reinsurance (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Premiums and other considerations: |  |  |
Premiums and other considerations, Direct | $ 7,381.8 | $ 6,962.2 | $ 5,796.1
Premiums and other considerations, Ceded | (531.6) | (491.3) | (456.4)
Net premiums and other considerations | 6,850.2 | 6,470.9 | 5,339.7
Benefits, claims and settlement expenses: |  |  |
Benefits, claims and settlement expenses, Direct | 10,131.5 | 9,365.4 | 8,103.6
Benefits, claims and settlement expenses, Ceded | (2,058.9) | (1,577.2) | (1,472.3)
Net benefits, claims and settlement expenses | 8,072.6 | 7,788.2 | 6,631.3
Liability for future policy benefits remeasurement (gain) loss: |  |  |
Liability for future policy benefits remeasurement (gain) loss, Direct | 252.7 | 737.4 | (179.5)
Liability for future policy benefits remeasurement (gain) loss, Ceded | 418.7 | (789.0) | (85.0)
Net liability for future policy benefits remeasurement (gain) loss | $ 671.4 | $ (51.6) | $ (264.5)

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- Definition Amount for policies ceded, of remeasurement gain (loss) on liability for future policy benefit from application of revised benefit ratio as of contract issue. Includes, but is not limited to, remeasurement gain (loss) for annuitization insurance benefit, death and other insurance benefits, and traditional and limited-payment contracts. + References No definition available. + Details
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- Definition Amount before effect of policies ceded, of remeasurement gain (loss) on liability for future policy benefit from application of revised benefit ratio as of contract issue. Includes, but is not limited to, remeasurement gain (loss) for annuitization insurance benefit, death and other insurance benefits, and traditional and limited-payment contracts. + References No definition available. + Details
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- Definition Amount of earned premiums ceded to other entities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column C)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477965/944-235-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479032/944-605-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478832/944-605-45-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479032/944-605-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479032/944-605-50-1 + Details
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